CNC 2240 Plasma Table

34by151

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Im replacing a comercial 1525 table I have now. After much searching for a bigger one that has all the features I want I came to the conclusion I need to just build it myself

Here is a look at the new CNC table design



View attachment 369388

I still have a few things to change before I get to cutting and welding.
Not everything is shown in the pic, like the cable chains and plumbing

Still working on the splash gutters but got 90% of waht I want into the design
The table measures 2200mmx4000mm (outside dimentions)
This will take 3mx1.8m sheets with a parking area for the gantry
Slats sare curved and reversable
Below the slats is a mesh to catch parts
Parking areas is 500mm long and incorprates a sump
The IBC's under the table are cut down to 750L's each
Two pumps (pool pumps) one for drain and one for fill will raise/lower the ware in about 2 minutes
The 3rd bay under the table will also have a pool sand filter to clean the water

I have also included a camera and scribe on the Z axis
Camera will be used for edge finding and tracing

Just need to finalise the spill gutter before I can do some FEA tests on the design
Im looking to get 8g acceleration out of the gantry.
So minimising gantry weight is a big condideration while keeping defection of the beam under control during acceleration
 

brino

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Wow! That's big......

This will take 3mx1.8m sheets with a parking area for the gantry

You'll need a parking area for the entire project!
I can only dream about a shop big enough to house that thing.

The IBC's under the table are cut down to 750L's each
Sorry, what's an "IBC"? :dunno:

Thanks for sharing this!
-brino
 

34by151

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Wow! That's big......



You'll need a parking area for the entire project!
I can only dream about a shop big enough to house that thing.
I live on a farm so lots of room

I built a new shed/workshop a few years ago
It is 30Mx18M inside with 6m awnings on all sides

Believe it or not it now feels small
 

Papa Charlie

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On your water system. Is the plan to gravity drain the torch pan into the sand unit after a screen, and then daisy chain through the last two IBC's. I assume you are doing this for maintenance and it is not a constant flow system.

Nice table design, were you planning on running servo motors or Stepper motors, direct drive or through belt systems?
 

34by151

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It will gravity feed but im including 2 pumps

It will pass though the sand filter on both fill and drain
2 pumps are simpler and cheaper then one pump and 4 solenoid valves

Its just to filter the soot, all the dross will remain in the table.
I have deigned for easy cleanout with a flat deck on the water table allowing for an easy scrape of the dross
IE no ridges to move over

Its going to run closed loop stepper drives which is more or less the same as servo.
Its a geared drive 5:1 to the pinion then a rack and pinnion
The rack is using helical gears on each axis to prevent backlash

Im designing for 8g alleleration
 

Papa Charlie

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It will gravity feed but im including 2 pumps

It will pass though the sand filter on both fill and drain
2 pumps are simpler and cheaper then one pump and 4 solenoid valves

Its just to filter the soot, all the dross will remain in the table.
I have deigned for easy cleanout with a flat deck on the water table allowing for an easy scrape of the dross
IE no ridges to move over

Its going to run closed loop stepper drives which is more or less the same as servo.
Its a geared drive 5:1 to the pinion then a rack and pinnion
The rack is using helical gears on each axis to prevent backlash

Im designing for 8g alleleration
Thanks very much for sharing. I have plans to build my own when I get into my shop.
 

34by151

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I tend to drain my table after cutting to pick out the parts
Makes it a lot easier to fech all the small bits
If you picking out of the water you get the soot all over your hands and its hard to get off
Rubber Gloves are a pita as are leather ones

So its easier to drain (assuming thats fast) then refill

This is where a mesh under your slats come into play (finding the parts)

Im using a sand filter on my current table allthough the media is glass bead. Glass filters better than sand.
I have this plumbed with a greywater pump for pump out and the sand filter for pump in
These are connected to an IBC tank, inlet on the bottom and outlet on the top

The output of the filter has a 3way valve. So I can suck from the bottom of the tank and fill the table or return to the top of the tank
Running the filter from the tank to the tank for about 10 mins turns the water from black to clear.
I tend to do this while im sorting out the cut parts and moving sheets with the forklift
A quick backwash of the filter expells all the soot

I only tend to do a table cleanout when the dross gets 50mm or so high

Also I use bore water for the table. Our bore water is drinkable. I put some baking soda in the water to control the rust
 

Papa Charlie

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We used a sand filter on our pool we had in our last home. The sand/glass is not smooth like you would find at the beach. If you look at it through a microscope, it is very jagged. Those irregularities catch the solids as the water passes through much better. I was also able to back flush the filter like you describe, that went into the city sewer system.

Great idea for handling the water and removing the contaminates on a plasma table. I had never thought about the process for a plasma table.
 
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